Photoluminescence spectroscopy of pure pentacene, perfluoropentacene and mixed thin films

Details Photoluminescence spectroscopy of pure pentacene, perfluoropentacene and mixed thin films Photoluminescence spectroscopy of pure pentacene, perfluoropentacene and mixed thin films

2012-01-19

arxiv.org/abs/1201.4146v1

Physics

Condensed Matter

Materials Science

9 pages, 6 figures, accepted for publication in J. Chem. Phys

Scientific paper

10.1063/1.3677839

We report detailed temperature dependent photoluminescence (PL) spectra of pentacene (PEN), perfluoropentacene (PFP), and PEN:PFP mixed thin films grown on SiO2. PEN and PFP are particularly suitable for this study, since they are structurally compatible for good intermixing and form a model donor/acceptor system. The PL spectra of PEN are discussed in the context of existing literature and compared to the new findings for PFP. We analyze the optical transitions observed in the spectra of PEN and PFP using time-dependent density functional theory (TD-DFT) calculations. Importantly, for the mixed PEN:PFP film we observe an optical transition in PL at 1.4 eV providing evidence for coupling effects in the blend. We discuss a possible charge-transfer (CT) and provide a tentative scheme of the optical transitions in the blended films.

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